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A gunman in a gas mask barged into a crowded Denver-area theater during a midnight premiere of the Batman movie on Friday, hurled a gas canister and then opened fire, killing 12 people and injuring at least 50 others in one of the deadliest mass shootings in recent U.S. history.

Click here to see photos from the scene.

Read or Share this story: http://www.khou.com/story/entertainment/2014/07/20/11776556/